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Low melting high lithia glass compositions and methods

Patent ·
OSTI ID:873367
 [1];  [1];  [1];  [1]
  1. Aiken, SC
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The invention relates to methods of vitrifying waste and for lowering the melting point of glass forming systems by including lithia formers in the glass forming composition in significant amounts, typically from about 0.16 wt % to about 11 wt %, based on the total glass forming oxides. The lithia is typically included as a replacement for alkali oxide glass formers that would normally be present in a particular glass forming system. Replacement can occur on a mole percent or weight percent basis, and typically results in a composition wherein lithia forms about 10 wt % to about 100 wt % of the alkali oxide glass formers present in the composition. The present invention also relates to the high lithia glass compositions formed by these methods. The invention is useful for stabilization of numerous types of waste materials, including aqueous waste streams, sludge solids, mixtures of aqueous supernate and sludge solids, combinations of spent filter aids from waste water treatment and waste sludges, supernate alone, incinerator ash, incinerator offgas blowdown, or combinations thereof, geological mine tailings and sludges, asbestos, inorganic filter media, cement waste forms in need of remediation, spent or partially spent ion exchange resins or zeolites, contaminated soils, lead paint, etc. The decrease in melting point achieved by the present invention desirably prevents volatilization of hazardous or radioactive species during vitrification.
Research Organization:
WESTINGHOUSE SAVANNAH RIVER CO
DOE Contract Number:
AC09-89SR18035
Assignee:
Westinghouse Savannah River Company (Aiken, SC)
Patent Number(s):
US 6145343
OSTI ID:
873367
Country of Publication:
United States
Language:
English

References (9)

Effect of MgO and BaO on Fe3+/Fe2+ Equilibrium in a Candidate Glass for Immobilization of High Level Nuclear Waste journal July 1997
Ion-channel match in mixed alkali glasses journal June 1991
Vitrification of Simulated Fernald K-65 Silo Waste at Low Temperature report January 1998
Development of glasses for the vitrification of high level liquid waste (HLLW) in a joule heated ceramic melter journal January 1996
The immobilization of high level radioactive wastes using ceramics and glasses journal January 1997
Systems approach to nuclear waste glass development journal July 1986
Elastic and Viscous Properties of Several Potash-Silica Glasses in the Annealing Range of Temperature* journal March 1941
Elastic and Viscous Properties of Several Soda-Silica Glasses in the Annealing Range of Temperature journal January 1937
Evaluation of glass as a matrix for solidifying Savannah River Plant waste: properties of glasses containing Li/sub 2/O report February 1979

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vitrifying
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volatilization
waste
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waste material
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